Created by the legend of the Catskills, Preston Jennings in 1935. This light-bodied mayfly imitation is a proven pattern. In the 80 some years of its existence, it has helped anglers do what they do best, catch more fish. When trying to identify the mayfly in the area. Catch one in your hat, if it’s tan or some other light shade of color, reach for the Gray Fox. She will not let you down.